diff --git a/proto/translation/v1.proto b/proto/translation/v1.proto
index 3bbe5c4..6b5d6a2 100644
--- a/proto/translation/v1.proto
+++ b/proto/translation/v1.proto
@@ -15,7 +15,7 @@ message Translation_1 {
 
   string propertyRef = 3 [(required) = true];
   string languageCode = 4 [(required) = true];
-  string regionCode = 5 [(required) = true];
+  optional string regionCode = 5;
   string message = 6 [(required) = true];
 
   message DocRef {
diff --git a/schema/translation/v1.json b/schema/translation/v1.json
index bd6df0d..4c70b67 100644
--- a/schema/translation/v1.json
+++ b/schema/translation/v1.json
@@ -69,7 +69,6 @@
     "docRefType",
     "propertyRef",
     "languageCode",
-    "regionCode",
     "message"
   ],
   "additionalProperties": false
diff --git a/src/lib/decode-conversions.ts b/src/lib/decode-conversions.ts
index af0376e..94a13bd 100644
--- a/src/lib/decode-conversions.ts
+++ b/src/lib/decode-conversions.ts
@@ -285,7 +285,6 @@ export const convertTranslation: ConvertFunction<'translation'> = (
   ensure(message.docRef.versionId, 'translation.docRef', 'versionId')
   ensure(propertyRef, 'translation', 'propertyRef')
   ensure(languageCode, 'translation', 'languageCode')
-  ensure(regionCode, 'translation', 'regionCode')
   ensure(translationMessage, 'translation', 'translationMessage')
   return {
     ...jsonSchemaCommon,
diff --git a/test/fixtures/good-docs-minimal.js b/test/fixtures/good-docs-minimal.js
index b748e98..662999d 100644
--- a/test/fixtures/good-docs-minimal.js
+++ b/test/fixtures/good-docs-minimal.js
@@ -185,7 +185,6 @@ export const goodDocsMinimal = [
       docRefType: 'field',
       propertyRef: 'label',
       languageCode: 'qu',
-      regionCode: 'PE',
       message: `sach'a`,
     },
     expected: {},